1 /*-
2 * modified for EXT2FS support in Lites 1.1
3 *
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
6 */
7 /*-
8 * SPDX-License-Identifier: BSD-3-Clause
9 *
10 * Copyright (c) 1982, 1986, 1989, 1993
11 * The Regents of the University of California. All rights reserved.
12 * (c) UNIX System Laboratories, Inc.
13 * All or some portions of this file are derived from material licensed
14 * to the University of California by American Telephone and Telegraph
15 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
16 * the permission of UNIX System Laboratories, Inc.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
21 * 1. Redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer.
23 * 2. Redistributions in binary form must reproduce the above copyright
24 * notice, this list of conditions and the following disclaimer in the
25 * documentation and/or other materials provided with the distribution.
26 * 3. Neither the name of the University nor the names of its contributors
27 * may be used to endorse or promote products derived from this software
28 * without specific prior written permission.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * SUCH DAMAGE.
41 */
42
43 #include "opt_suiddir.h"
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/fcntl.h>
49 #include <sys/filio.h>
50 #include <sys/limits.h>
51 #include <sys/sdt.h>
52 #include <sys/stat.h>
53 #include <sys/bio.h>
54 #include <sys/buf.h>
55 #include <sys/endian.h>
56 #include <sys/priv.h>
57 #include <sys/rwlock.h>
58 #include <sys/mount.h>
59 #include <sys/unistd.h>
60 #include <sys/time.h>
61 #include <sys/vnode.h>
62 #include <sys/namei.h>
63 #include <sys/lockf.h>
64 #include <sys/event.h>
65 #include <sys/conf.h>
66 #include <sys/file.h>
67 #include <sys/extattr.h>
68 #include <sys/vmmeter.h>
69
70 #include <vm/vm.h>
71 #include <vm/vm_param.h>
72 #include <vm/vm_extern.h>
73 #include <vm/vm_object.h>
74 #include <vm/vm_page.h>
75 #include <vm/vm_pager.h>
76 #include <vm/vnode_pager.h>
77
78 #include "opt_directio.h"
79
80 #include <ufs/ufs/dir.h>
81
82 #include <fs/ext2fs/fs.h>
83 #include <fs/ext2fs/inode.h>
84 #include <fs/ext2fs/ext2_acl.h>
85 #include <fs/ext2fs/ext2fs.h>
86 #include <fs/ext2fs/ext2_extern.h>
87 #include <fs/ext2fs/ext2_dinode.h>
88 #include <fs/ext2fs/ext2_dir.h>
89 #include <fs/ext2fs/ext2_mount.h>
90 #include <fs/ext2fs/ext2_extattr.h>
91 #include <fs/ext2fs/ext2_extents.h>
92
93 SDT_PROVIDER_DECLARE(ext2fs);
94 /*
95 * ext2fs trace probe:
96 * arg0: verbosity. Higher numbers give more verbose messages
97 * arg1: Textual message
98 */
99 SDT_PROBE_DEFINE2(ext2fs, , vnops, trace, "int", "char*");
100
101 static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *);
102 static void ext2_itimes_locked(struct vnode *);
103
104 static vop_access_t ext2_access;
105 static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *);
106 static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *,
107 struct thread *);
108 static vop_close_t ext2_close;
109 static vop_create_t ext2_create;
110 static vop_fsync_t ext2_fsync;
111 static vop_getattr_t ext2_getattr;
112 static vop_ioctl_t ext2_ioctl;
113 static vop_link_t ext2_link;
114 static vop_mkdir_t ext2_mkdir;
115 static vop_mknod_t ext2_mknod;
116 static vop_open_t ext2_open;
117 static vop_pathconf_t ext2_pathconf;
118 static vop_print_t ext2_print;
119 static vop_read_t ext2_read;
120 static vop_readlink_t ext2_readlink;
121 static vop_remove_t ext2_remove;
122 static vop_rename_t ext2_rename;
123 static vop_rmdir_t ext2_rmdir;
124 static vop_setattr_t ext2_setattr;
125 static vop_strategy_t ext2_strategy;
126 static vop_symlink_t ext2_symlink;
127 static vop_write_t ext2_write;
128 static vop_deleteextattr_t ext2_deleteextattr;
129 static vop_getextattr_t ext2_getextattr;
130 static vop_listextattr_t ext2_listextattr;
131 static vop_setextattr_t ext2_setextattr;
132 static vop_vptofh_t ext2_vptofh;
133 static vop_close_t ext2fifo_close;
134
135 /* Global vfs data structures for ext2. */
136 struct vop_vector ext2_vnodeops = {
137 .vop_default = &default_vnodeops,
138 .vop_access = ext2_access,
139 .vop_bmap = ext2_bmap,
140 .vop_cachedlookup = ext2_lookup,
141 .vop_close = ext2_close,
142 .vop_create = ext2_create,
143 .vop_fsync = ext2_fsync,
144 .vop_getpages = vnode_pager_local_getpages,
145 .vop_getpages_async = vnode_pager_local_getpages_async,
146 .vop_getattr = ext2_getattr,
147 .vop_inactive = ext2_inactive,
148 .vop_ioctl = ext2_ioctl,
149 .vop_link = ext2_link,
150 .vop_lookup = vfs_cache_lookup,
151 .vop_mkdir = ext2_mkdir,
152 .vop_mknod = ext2_mknod,
153 .vop_open = ext2_open,
154 .vop_pathconf = ext2_pathconf,
155 .vop_poll = vop_stdpoll,
156 .vop_print = ext2_print,
157 .vop_read = ext2_read,
158 .vop_readdir = ext2_readdir,
159 .vop_readlink = ext2_readlink,
160 .vop_reallocblks = ext2_reallocblks,
161 .vop_reclaim = ext2_reclaim,
162 .vop_remove = ext2_remove,
163 .vop_rename = ext2_rename,
164 .vop_rmdir = ext2_rmdir,
165 .vop_setattr = ext2_setattr,
166 .vop_strategy = ext2_strategy,
167 .vop_symlink = ext2_symlink,
168 .vop_write = ext2_write,
169 .vop_deleteextattr = ext2_deleteextattr,
170 .vop_getextattr = ext2_getextattr,
171 .vop_listextattr = ext2_listextattr,
172 .vop_setextattr = ext2_setextattr,
173 #ifdef UFS_ACL
174 .vop_getacl = ext2_getacl,
175 .vop_setacl = ext2_setacl,
176 .vop_aclcheck = ext2_aclcheck,
177 #endif /* UFS_ACL */
178 .vop_vptofh = ext2_vptofh,
179 };
180 VFS_VOP_VECTOR_REGISTER(ext2_vnodeops);
181
182 struct vop_vector ext2_fifoops = {
183 .vop_default = &fifo_specops,
184 .vop_access = ext2_access,
185 .vop_close = ext2fifo_close,
186 .vop_fsync = ext2_fsync,
187 .vop_getattr = ext2_getattr,
188 .vop_inactive = ext2_inactive,
189 .vop_pathconf = ext2_pathconf,
190 .vop_print = ext2_print,
191 .vop_read = VOP_PANIC,
192 .vop_reclaim = ext2_reclaim,
193 .vop_setattr = ext2_setattr,
194 .vop_write = VOP_PANIC,
195 .vop_vptofh = ext2_vptofh,
196 };
197 VFS_VOP_VECTOR_REGISTER(ext2_fifoops);
198
199 /*
200 * A virgin directory (no blushing please).
201 * Note that the type and namlen fields are reversed relative to ext2.
202 * Also, we don't use `struct odirtemplate', since it would just cause
203 * endianness problems.
204 */
205 static struct dirtemplate mastertemplate = {
206 0, htole16(12), 1, EXT2_FT_DIR, ".",
207 0, htole16(DIRBLKSIZ - 12), 2, EXT2_FT_DIR, ".."
208 };
209 static struct dirtemplate omastertemplate = {
210 0, htole16(12), 1, EXT2_FT_UNKNOWN, ".",
211 0, htole16(DIRBLKSIZ - 12), 2, EXT2_FT_UNKNOWN, ".."
212 };
213
214 static void
ext2_itimes_locked(struct vnode * vp)215 ext2_itimes_locked(struct vnode *vp)
216 {
217 struct inode *ip;
218 struct timespec ts;
219
220 ASSERT_VI_LOCKED(vp, __func__);
221
222 ip = VTOI(vp);
223 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
224 return;
225 if ((vp->v_type == VBLK || vp->v_type == VCHR))
226 ip->i_flag |= IN_LAZYMOD;
227 else
228 ip->i_flag |= IN_MODIFIED;
229 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
230 vfs_timestamp(&ts);
231 if (ip->i_flag & IN_ACCESS) {
232 ip->i_atime = ts.tv_sec;
233 ip->i_atimensec = ts.tv_nsec;
234 }
235 if (ip->i_flag & IN_UPDATE) {
236 ip->i_mtime = ts.tv_sec;
237 ip->i_mtimensec = ts.tv_nsec;
238 ip->i_modrev++;
239 }
240 if (ip->i_flag & IN_CHANGE) {
241 ip->i_ctime = ts.tv_sec;
242 ip->i_ctimensec = ts.tv_nsec;
243 }
244 }
245 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
246 }
247
248 void
ext2_itimes(struct vnode * vp)249 ext2_itimes(struct vnode *vp)
250 {
251
252 VI_LOCK(vp);
253 ext2_itimes_locked(vp);
254 VI_UNLOCK(vp);
255 }
256
257 /*
258 * Create a regular file
259 */
260 static int
ext2_create(struct vop_create_args * ap)261 ext2_create(struct vop_create_args *ap)
262 {
263 int error;
264
265 error =
266 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
267 ap->a_dvp, ap->a_vpp, ap->a_cnp);
268 if (error != 0)
269 return (error);
270 if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0)
271 cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp);
272 return (0);
273 }
274
275 static int
ext2_open(struct vop_open_args * ap)276 ext2_open(struct vop_open_args *ap)
277 {
278
279 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR)
280 return (EOPNOTSUPP);
281
282 /*
283 * Files marked append-only must be opened for appending.
284 */
285 if ((VTOI(ap->a_vp)->i_flags & APPEND) &&
286 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
287 return (EPERM);
288
289 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td);
290
291 return (0);
292 }
293
294 /*
295 * Close called.
296 *
297 * Update the times on the inode.
298 */
299 static int
ext2_close(struct vop_close_args * ap)300 ext2_close(struct vop_close_args *ap)
301 {
302 struct vnode *vp = ap->a_vp;
303
304 VI_LOCK(vp);
305 if (vp->v_usecount > 1)
306 ext2_itimes_locked(vp);
307 VI_UNLOCK(vp);
308 return (0);
309 }
310
311 static int
ext2_access(struct vop_access_args * ap)312 ext2_access(struct vop_access_args *ap)
313 {
314 struct vnode *vp = ap->a_vp;
315 struct inode *ip = VTOI(vp);
316 accmode_t accmode = ap->a_accmode;
317 int error;
318
319 /*
320 * Disallow write attempts on read-only file systems;
321 * unless the file is a socket, fifo, or a block or
322 * character device resident on the file system.
323 */
324 if (accmode & VWRITE) {
325 switch (vp->v_type) {
326 case VDIR:
327 case VLNK:
328 case VREG:
329 if (vp->v_mount->mnt_flag & MNT_RDONLY)
330 return (EROFS);
331 break;
332 default:
333 break;
334 }
335 }
336
337 /* If immutable bit set, nobody gets to write it. */
338 if ((accmode & VWRITE) && (ip->i_flags & SF_IMMUTABLE))
339 return (EPERM);
340
341 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
342 ap->a_accmode, ap->a_cred);
343 return (error);
344 }
345
346 static int
ext2_getattr(struct vop_getattr_args * ap)347 ext2_getattr(struct vop_getattr_args *ap)
348 {
349 struct vnode *vp = ap->a_vp;
350 struct inode *ip = VTOI(vp);
351 struct vattr *vap = ap->a_vap;
352
353 ext2_itimes(vp);
354 /*
355 * Copy from inode table
356 */
357 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev);
358 vap->va_fileid = ip->i_number;
359 vap->va_mode = ip->i_mode & ~IFMT;
360 vap->va_nlink = ip->i_nlink;
361 vap->va_uid = ip->i_uid;
362 vap->va_gid = ip->i_gid;
363 vap->va_rdev = ip->i_rdev;
364 vap->va_size = ip->i_size;
365 vap->va_atime.tv_sec = ip->i_atime;
366 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0;
367 vap->va_mtime.tv_sec = ip->i_mtime;
368 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0;
369 vap->va_ctime.tv_sec = ip->i_ctime;
370 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0;
371 if (E2DI_HAS_XTIME(ip)) {
372 vap->va_birthtime.tv_sec = ip->i_birthtime;
373 vap->va_birthtime.tv_nsec = ip->i_birthnsec;
374 }
375 vap->va_flags = ip->i_flags;
376 vap->va_gen = ip->i_gen;
377 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
378 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks);
379 vap->va_type = IFTOVT(ip->i_mode);
380 vap->va_filerev = ip->i_modrev;
381 return (0);
382 }
383
384 /*
385 * Set attribute vnode op. called from several syscalls
386 */
387 static int
ext2_setattr(struct vop_setattr_args * ap)388 ext2_setattr(struct vop_setattr_args *ap)
389 {
390 struct vattr *vap = ap->a_vap;
391 struct vnode *vp = ap->a_vp;
392 struct inode *ip = VTOI(vp);
393 struct ucred *cred = ap->a_cred;
394 struct thread *td = curthread;
395 int error;
396
397 /*
398 * Check for unsettable attributes.
399 */
400 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
401 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
402 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
403 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
404 return (EINVAL);
405 }
406 if (vap->va_flags != VNOVAL) {
407 /* Disallow flags not supported by ext2fs. */
408 if (vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP))
409 return (EOPNOTSUPP);
410
411 if (vp->v_mount->mnt_flag & MNT_RDONLY)
412 return (EROFS);
413 /*
414 * Callers may only modify the file flags on objects they
415 * have VADMIN rights for.
416 */
417 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
418 return (error);
419 /*
420 * Unprivileged processes and privileged processes in
421 * jail() are not permitted to unset system flags, or
422 * modify flags if any system flags are set.
423 * Privileged non-jail processes may not modify system flags
424 * if securelevel > 0 and any existing system flags are set.
425 */
426 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS)) {
427 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) {
428 error = securelevel_gt(cred, 0);
429 if (error)
430 return (error);
431 }
432 } else {
433 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) ||
434 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE))
435 return (EPERM);
436 }
437 ip->i_flags = vap->va_flags;
438 ip->i_flag |= IN_CHANGE;
439 if (ip->i_flags & (IMMUTABLE | APPEND))
440 return (0);
441 }
442 if (ip->i_flags & (IMMUTABLE | APPEND))
443 return (EPERM);
444 /*
445 * Go through the fields and update iff not VNOVAL.
446 */
447 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
448 if (vp->v_mount->mnt_flag & MNT_RDONLY)
449 return (EROFS);
450 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred,
451 td)) != 0)
452 return (error);
453 }
454 if (vap->va_size != VNOVAL) {
455 /*
456 * Disallow write attempts on read-only file systems;
457 * unless the file is a socket, fifo, or a block or
458 * character device resident on the file system.
459 */
460 switch (vp->v_type) {
461 case VDIR:
462 return (EISDIR);
463 case VLNK:
464 case VREG:
465 if (vp->v_mount->mnt_flag & MNT_RDONLY)
466 return (EROFS);
467 break;
468 default:
469 break;
470 }
471 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0)
472 return (error);
473 }
474 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
475 if (vp->v_mount->mnt_flag & MNT_RDONLY)
476 return (EROFS);
477 /*
478 * From utimes(2):
479 * If times is NULL, ... The caller must be the owner of
480 * the file, have permission to write the file, or be the
481 * super-user.
482 * If times is non-NULL, ... The caller must be the owner of
483 * the file or be the super-user.
484 */
485 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) &&
486 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
487 (error = VOP_ACCESS(vp, VWRITE, cred, td))))
488 return (error);
489 ip->i_flag |= IN_CHANGE | IN_MODIFIED;
490 if (vap->va_atime.tv_sec != VNOVAL) {
491 ip->i_flag &= ~IN_ACCESS;
492 ip->i_atime = vap->va_atime.tv_sec;
493 ip->i_atimensec = vap->va_atime.tv_nsec;
494 }
495 if (vap->va_mtime.tv_sec != VNOVAL) {
496 ip->i_flag &= ~IN_UPDATE;
497 ip->i_mtime = vap->va_mtime.tv_sec;
498 ip->i_mtimensec = vap->va_mtime.tv_nsec;
499 }
500 if (E2DI_HAS_XTIME(ip) && vap->va_birthtime.tv_sec != VNOVAL) {
501 ip->i_birthtime = vap->va_birthtime.tv_sec;
502 ip->i_birthnsec = vap->va_birthtime.tv_nsec;
503 }
504 error = ext2_update(vp, 0);
505 if (error)
506 return (error);
507 }
508 error = 0;
509 if (vap->va_mode != (mode_t)VNOVAL) {
510 if (vp->v_mount->mnt_flag & MNT_RDONLY)
511 return (EROFS);
512 error = ext2_chmod(vp, (int)vap->va_mode, cred, td);
513 }
514 return (error);
515 }
516
517 /*
518 * Change the mode on a file.
519 * Inode must be locked before calling.
520 */
521 static int
ext2_chmod(struct vnode * vp,int mode,struct ucred * cred,struct thread * td)522 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td)
523 {
524 struct inode *ip = VTOI(vp);
525 int error;
526
527 /*
528 * To modify the permissions on a file, must possess VADMIN
529 * for that file.
530 */
531 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
532 return (error);
533 /*
534 * Privileged processes may set the sticky bit on non-directories,
535 * as well as set the setgid bit on a file with a group that the
536 * process is not a member of.
537 */
538 if (vp->v_type != VDIR && (mode & S_ISTXT)) {
539 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE);
540 if (error)
541 return (EFTYPE);
542 }
543 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
544 error = priv_check_cred(cred, PRIV_VFS_SETGID);
545 if (error)
546 return (error);
547 }
548 ip->i_mode &= ~ALLPERMS;
549 ip->i_mode |= (mode & ALLPERMS);
550 ip->i_flag |= IN_CHANGE;
551 return (0);
552 }
553
554 /*
555 * Perform chown operation on inode ip;
556 * inode must be locked prior to call.
557 */
558 static int
ext2_chown(struct vnode * vp,uid_t uid,gid_t gid,struct ucred * cred,struct thread * td)559 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
560 struct thread *td)
561 {
562 struct inode *ip = VTOI(vp);
563 uid_t ouid;
564 gid_t ogid;
565 int error = 0;
566
567 if (uid == (uid_t)VNOVAL)
568 uid = ip->i_uid;
569 if (gid == (gid_t)VNOVAL)
570 gid = ip->i_gid;
571 /*
572 * To modify the ownership of a file, must possess VADMIN
573 * for that file.
574 */
575 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
576 return (error);
577 /*
578 * To change the owner of a file, or change the group of a file
579 * to a group of which we are not a member, the caller must
580 * have privilege.
581 */
582 if (uid != ip->i_uid || (gid != ip->i_gid &&
583 !groupmember(gid, cred))) {
584 error = priv_check_cred(cred, PRIV_VFS_CHOWN);
585 if (error)
586 return (error);
587 }
588 ogid = ip->i_gid;
589 ouid = ip->i_uid;
590 ip->i_gid = gid;
591 ip->i_uid = uid;
592 ip->i_flag |= IN_CHANGE;
593 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
594 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID) != 0)
595 ip->i_mode &= ~(ISUID | ISGID);
596 }
597 return (0);
598 }
599
600 /*
601 * Synch an open file.
602 */
603 /* ARGSUSED */
604 static int
ext2_fsync(struct vop_fsync_args * ap)605 ext2_fsync(struct vop_fsync_args *ap)
606 {
607 /*
608 * Flush all dirty buffers associated with a vnode.
609 */
610
611 vop_stdfsync(ap);
612
613 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT));
614 }
615
616 static int
ext2_check_mknod_limits(dev_t dev)617 ext2_check_mknod_limits(dev_t dev)
618 {
619 unsigned maj = major(dev);
620 unsigned min = minor(dev);
621
622 if (maj > EXT2_MAJOR_MAX || min > EXT2_MINOR_MAX)
623 return (EINVAL);
624
625 return (0);
626 }
627
628 /*
629 * Mknod vnode call
630 */
631 /* ARGSUSED */
632 static int
ext2_mknod(struct vop_mknod_args * ap)633 ext2_mknod(struct vop_mknod_args *ap)
634 {
635 struct vattr *vap = ap->a_vap;
636 struct vnode **vpp = ap->a_vpp;
637 struct inode *ip;
638 ino_t ino;
639 int error;
640
641 if (vap->va_rdev != VNOVAL) {
642 error = ext2_check_mknod_limits(vap->va_rdev);
643 if (error)
644 return (error);
645 }
646
647 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
648 ap->a_dvp, vpp, ap->a_cnp);
649 if (error)
650 return (error);
651 ip = VTOI(*vpp);
652 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
653 if (vap->va_rdev != VNOVAL)
654 ip->i_rdev = vap->va_rdev;
655
656 /*
657 * Remove inode, then reload it through VFS_VGET so it is
658 * checked to see if it is an alias of an existing entry in
659 * the inode cache. XXX I don't believe this is necessary now.
660 */
661 (*vpp)->v_type = VNON;
662 ino = ip->i_number; /* Save this before vgone() invalidates ip. */
663 vgone(*vpp);
664 vput(*vpp);
665 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
666 if (error) {
667 *vpp = NULL;
668 return (error);
669 }
670 return (0);
671 }
672
673 static int
ext2_remove(struct vop_remove_args * ap)674 ext2_remove(struct vop_remove_args *ap)
675 {
676 struct inode *ip;
677 struct vnode *vp = ap->a_vp;
678 struct vnode *dvp = ap->a_dvp;
679 int error;
680
681 ip = VTOI(vp);
682 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
683 (VTOI(dvp)->i_flags & APPEND)) {
684 error = EPERM;
685 goto out;
686 }
687 error = ext2_dirremove(dvp, ap->a_cnp);
688 if (error == 0) {
689 ip->i_nlink--;
690 ip->i_flag |= IN_CHANGE;
691 }
692 out:
693 return (error);
694 }
695
696 /*
697 * link vnode call
698 */
699 static int
ext2_link(struct vop_link_args * ap)700 ext2_link(struct vop_link_args *ap)
701 {
702 struct vnode *vp = ap->a_vp;
703 struct vnode *tdvp = ap->a_tdvp;
704 struct componentname *cnp = ap->a_cnp;
705 struct inode *ip;
706 int error;
707
708 ip = VTOI(vp);
709 if ((nlink_t)ip->i_nlink >= EXT4_LINK_MAX) {
710 error = EMLINK;
711 goto out;
712 }
713 if (ip->i_flags & (IMMUTABLE | APPEND)) {
714 error = EPERM;
715 goto out;
716 }
717 ip->i_nlink++;
718 ip->i_flag |= IN_CHANGE;
719 error = ext2_update(vp, !DOINGASYNC(vp));
720 if (!error)
721 error = ext2_direnter(ip, tdvp, cnp);
722 if (error) {
723 ip->i_nlink--;
724 ip->i_flag |= IN_CHANGE;
725 }
726 out:
727 return (error);
728 }
729
730 static int
ext2_inc_nlink(struct inode * ip)731 ext2_inc_nlink(struct inode *ip)
732 {
733
734 ip->i_nlink++;
735
736 if (S_ISDIR(ip->i_mode) &&
737 EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK) &&
738 ip->i_nlink > 1) {
739 if (ip->i_nlink >= EXT4_LINK_MAX || ip->i_nlink == 2)
740 ip->i_nlink = 1;
741 } else if (ip->i_nlink > EXT4_LINK_MAX) {
742 ip->i_nlink--;
743 return (EMLINK);
744 }
745
746 return (0);
747 }
748
749 static void
ext2_dec_nlink(struct inode * ip)750 ext2_dec_nlink(struct inode *ip)
751 {
752
753 if (!S_ISDIR(ip->i_mode) || ip->i_nlink > 2)
754 ip->i_nlink--;
755 }
756
757 /*
758 * Rename system call.
759 * rename("foo", "bar");
760 * is essentially
761 * unlink("bar");
762 * link("foo", "bar");
763 * unlink("foo");
764 * but ``atomically''. Can't do full commit without saving state in the
765 * inode on disk which isn't feasible at this time. Best we can do is
766 * always guarantee the target exists.
767 *
768 * Basic algorithm is:
769 *
770 * 1) Bump link count on source while we're linking it to the
771 * target. This also ensure the inode won't be deleted out
772 * from underneath us while we work (it may be truncated by
773 * a concurrent `trunc' or `open' for creation).
774 * 2) Link source to destination. If destination already exists,
775 * delete it first.
776 * 3) Unlink source reference to inode if still around. If a
777 * directory was moved and the parent of the destination
778 * is different from the source, patch the ".." entry in the
779 * directory.
780 */
781 static int
ext2_rename(struct vop_rename_args * ap)782 ext2_rename(struct vop_rename_args *ap)
783 {
784 struct vnode *tvp = ap->a_tvp;
785 struct vnode *tdvp = ap->a_tdvp;
786 struct vnode *fvp = ap->a_fvp;
787 struct vnode *fdvp = ap->a_fdvp;
788 struct componentname *tcnp = ap->a_tcnp;
789 struct componentname *fcnp = ap->a_fcnp;
790 struct inode *ip, *xp, *dp;
791 struct dirtemplate *dirbuf;
792 int doingdirectory = 0, oldparent = 0, newparent = 0;
793 int error = 0;
794 u_char namlen;
795
796 /*
797 * Check for cross-device rename.
798 */
799 if ((fvp->v_mount != tdvp->v_mount) ||
800 (tvp && (fvp->v_mount != tvp->v_mount))) {
801 error = EXDEV;
802 abortit:
803 if (tdvp == tvp)
804 vrele(tdvp);
805 else
806 vput(tdvp);
807 if (tvp)
808 vput(tvp);
809 vrele(fdvp);
810 vrele(fvp);
811 return (error);
812 }
813
814 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
815 (VTOI(tdvp)->i_flags & APPEND))) {
816 error = EPERM;
817 goto abortit;
818 }
819
820 /*
821 * Renaming a file to itself has no effect. The upper layers should
822 * not call us in that case. Temporarily just warn if they do.
823 */
824 if (fvp == tvp) {
825 SDT_PROBE2(ext2fs, , vnops, trace, 1,
826 "rename: fvp == tvp (can't happen)");
827 error = 0;
828 goto abortit;
829 }
830
831 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
832 goto abortit;
833 dp = VTOI(fdvp);
834 ip = VTOI(fvp);
835 if (ip->i_nlink >= EXT4_LINK_MAX &&
836 !EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) {
837 VOP_UNLOCK(fvp);
838 error = EMLINK;
839 goto abortit;
840 }
841 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
842 || (dp->i_flags & APPEND)) {
843 VOP_UNLOCK(fvp);
844 error = EPERM;
845 goto abortit;
846 }
847 if ((ip->i_mode & IFMT) == IFDIR) {
848 /*
849 * Avoid ".", "..", and aliases of "." for obvious reasons.
850 */
851 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
852 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT ||
853 (ip->i_flag & IN_RENAME)) {
854 VOP_UNLOCK(fvp);
855 error = EINVAL;
856 goto abortit;
857 }
858 ip->i_flag |= IN_RENAME;
859 oldparent = dp->i_number;
860 doingdirectory++;
861 }
862 vrele(fdvp);
863
864 /*
865 * When the target exists, both the directory
866 * and target vnodes are returned locked.
867 */
868 dp = VTOI(tdvp);
869 xp = NULL;
870 if (tvp)
871 xp = VTOI(tvp);
872
873 /*
874 * 1) Bump link count while we're moving stuff
875 * around. If we crash somewhere before
876 * completing our work, the link count
877 * may be wrong, but correctable.
878 */
879 ext2_inc_nlink(ip);
880 ip->i_flag |= IN_CHANGE;
881 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) {
882 VOP_UNLOCK(fvp);
883 goto bad;
884 }
885
886 /*
887 * If ".." must be changed (ie the directory gets a new
888 * parent) then the source directory must not be in the
889 * directory hierarchy above the target, as this would
890 * orphan everything below the source directory. Also
891 * the user must have write permission in the source so
892 * as to be able to change "..". We must repeat the call
893 * to namei, as the parent directory is unlocked by the
894 * call to checkpath().
895 */
896 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, curthread);
897 VOP_UNLOCK(fvp);
898 if (oldparent != dp->i_number)
899 newparent = dp->i_number;
900 if (doingdirectory && newparent) {
901 if (error) /* write access check above */
902 goto bad;
903 if (xp != NULL)
904 vput(tvp);
905 error = ext2_checkpath(ip, dp, tcnp->cn_cred);
906 if (error)
907 goto out;
908 VREF(tdvp);
909 error = vfs_relookup(tdvp, &tvp, tcnp, true);
910 if (error)
911 goto out;
912 vrele(tdvp);
913 dp = VTOI(tdvp);
914 xp = NULL;
915 if (tvp)
916 xp = VTOI(tvp);
917 }
918 /*
919 * 2) If target doesn't exist, link the target
920 * to the source and unlink the source.
921 * Otherwise, rewrite the target directory
922 * entry to reference the source inode and
923 * expunge the original entry's existence.
924 */
925 if (xp == NULL) {
926 if (dp->i_devvp != ip->i_devvp)
927 panic("ext2_rename: EXDEV");
928 /*
929 * Account for ".." in new directory.
930 * When source and destination have the same
931 * parent we don't fool with the link count.
932 */
933 if (doingdirectory && newparent) {
934 error = ext2_inc_nlink(dp);
935 if (error)
936 goto bad;
937
938 dp->i_flag |= IN_CHANGE;
939 error = ext2_update(tdvp, !DOINGASYNC(tdvp));
940 if (error)
941 goto bad;
942 }
943 error = ext2_direnter(ip, tdvp, tcnp);
944 if (error) {
945 if (doingdirectory && newparent) {
946 ext2_dec_nlink(dp);
947 dp->i_flag |= IN_CHANGE;
948 (void)ext2_update(tdvp, 1);
949 }
950 goto bad;
951 }
952 vput(tdvp);
953 } else {
954 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp)
955 panic("ext2_rename: EXDEV");
956 /*
957 * Short circuit rename(foo, foo).
958 */
959 if (xp->i_number == ip->i_number)
960 panic("ext2_rename: same file");
961 /*
962 * If the parent directory is "sticky", then the user must
963 * own the parent directory, or the destination of the rename,
964 * otherwise the destination may not be changed (except by
965 * root). This implements append-only directories.
966 */
967 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
968 tcnp->cn_cred->cr_uid != dp->i_uid &&
969 xp->i_uid != tcnp->cn_cred->cr_uid) {
970 error = EPERM;
971 goto bad;
972 }
973 /*
974 * Target must be empty if a directory and have no links
975 * to it. Also, ensure source and target are compatible
976 * (both directories, or both not directories).
977 */
978 if ((xp->i_mode & IFMT) == IFDIR) {
979 if (!ext2_dirempty(xp, dp->i_number, tcnp->cn_cred)) {
980 error = ENOTEMPTY;
981 goto bad;
982 }
983 if (!doingdirectory) {
984 error = ENOTDIR;
985 goto bad;
986 }
987 cache_purge(tdvp);
988 } else if (doingdirectory) {
989 error = EISDIR;
990 goto bad;
991 }
992 error = ext2_dirrewrite(dp, ip, tcnp);
993 if (error)
994 goto bad;
995 /*
996 * If the target directory is in the same
997 * directory as the source directory,
998 * decrement the link count on the parent
999 * of the target directory.
1000 */
1001 if (doingdirectory && !newparent) {
1002 ext2_dec_nlink(dp);
1003 dp->i_flag |= IN_CHANGE;
1004 }
1005 vput(tdvp);
1006 /*
1007 * Adjust the link count of the target to
1008 * reflect the dirrewrite above. If this is
1009 * a directory it is empty and there are
1010 * no links to it, so we can squash the inode and
1011 * any space associated with it. We disallowed
1012 * renaming over top of a directory with links to
1013 * it above, as the remaining link would point to
1014 * a directory without "." or ".." entries.
1015 */
1016 ext2_dec_nlink(xp);
1017 if (doingdirectory) {
1018 if (xp->i_nlink > 2)
1019 panic("ext2_rename: linked directory");
1020 error = ext2_truncate(tvp, (off_t)0, IO_SYNC,
1021 tcnp->cn_cred, curthread);
1022 xp->i_nlink = 0;
1023 }
1024 xp->i_flag |= IN_CHANGE;
1025 vput(tvp);
1026 xp = NULL;
1027 }
1028
1029 /*
1030 * 3) Unlink the source.
1031 */
1032 fcnp->cn_flags &= ~MODMASK;
1033 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1034 VREF(fdvp);
1035 error = vfs_relookup(fdvp, &fvp, fcnp, true);
1036 if (error == 0)
1037 vrele(fdvp);
1038 if (fvp != NULL) {
1039 xp = VTOI(fvp);
1040 dp = VTOI(fdvp);
1041 } else {
1042 /*
1043 * From name has disappeared. IN_RENAME is not sufficient
1044 * to protect against directory races due to timing windows,
1045 * so we can't panic here.
1046 */
1047 vrele(ap->a_fvp);
1048 return (0);
1049 }
1050 /*
1051 * Ensure that the directory entry still exists and has not
1052 * changed while the new name has been entered. If the source is
1053 * a file then the entry may have been unlinked or renamed. In
1054 * either case there is no further work to be done. If the source
1055 * is a directory then it cannot have been rmdir'ed; its link
1056 * count of three would cause a rmdir to fail with ENOTEMPTY.
1057 * The IN_RENAME flag ensures that it cannot be moved by another
1058 * rename.
1059 */
1060 if (xp != ip) {
1061 /*
1062 * From name resolves to a different inode. IN_RENAME is
1063 * not sufficient protection against timing window races
1064 * so we can't panic here.
1065 */
1066 } else {
1067 /*
1068 * If the source is a directory with a
1069 * new parent, the link count of the old
1070 * parent directory must be decremented
1071 * and ".." set to point to the new parent.
1072 */
1073 if (doingdirectory && newparent) {
1074 ext2_dec_nlink(dp);
1075 dp->i_flag |= IN_CHANGE;
1076 dirbuf = malloc(dp->i_e2fs->e2fs_bsize, M_TEMP, M_WAITOK | M_ZERO);
1077 error = vn_rdwr(UIO_READ, fvp, (caddr_t)dirbuf,
1078 ip->i_e2fs->e2fs_bsize, (off_t)0,
1079 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
1080 tcnp->cn_cred, NOCRED, NULL, NULL);
1081 if (error == 0) {
1082 /* Like ufs little-endian: */
1083 namlen = dirbuf->dotdot_type;
1084 if (namlen != 2 ||
1085 dirbuf->dotdot_name[0] != '.' ||
1086 dirbuf->dotdot_name[1] != '.') {
1087 /*
1088 * The filesystem is in corrupted state,
1089 * need to run fsck to fix mangled dir
1090 * entry. From other side this error
1091 * need to be ignored because it is
1092 * too difficult to revert directories
1093 * to state before rename from this
1094 * point.
1095 */
1096 ext2_dirbad(xp, (doff_t)12,
1097 "rename: mangled dir");
1098 } else {
1099 dirbuf->dotdot_ino = htole32(newparent);
1100 /*
1101 * dirblock 0 could be htree root,
1102 * try both csum update functions.
1103 */
1104 ext2_dirent_csum_set(ip,
1105 (struct ext2fs_direct_2 *)dirbuf);
1106 ext2_dx_csum_set(ip,
1107 (struct ext2fs_direct_2 *)dirbuf);
1108 (void)vn_rdwr(UIO_WRITE, fvp,
1109 (caddr_t)dirbuf,
1110 ip->i_e2fs->e2fs_bsize,
1111 (off_t)0, UIO_SYSSPACE,
1112 IO_NODELOCKED | IO_SYNC |
1113 IO_NOMACCHECK, tcnp->cn_cred,
1114 NOCRED, NULL, NULL);
1115 cache_purge(fdvp);
1116 }
1117 }
1118 free(dirbuf, M_TEMP);
1119 }
1120 error = ext2_dirremove(fdvp, fcnp);
1121 if (!error) {
1122 ext2_dec_nlink(xp);
1123 xp->i_flag |= IN_CHANGE;
1124 }
1125 xp->i_flag &= ~IN_RENAME;
1126 }
1127 if (dp)
1128 vput(fdvp);
1129 if (xp)
1130 vput(fvp);
1131 vrele(ap->a_fvp);
1132 return (error);
1133
1134 bad:
1135 if (xp)
1136 vput(ITOV(xp));
1137 vput(ITOV(dp));
1138 out:
1139 if (doingdirectory)
1140 ip->i_flag &= ~IN_RENAME;
1141 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) {
1142 ext2_dec_nlink(ip);
1143 ip->i_flag |= IN_CHANGE;
1144 ip->i_flag &= ~IN_RENAME;
1145 vput(fvp);
1146 } else
1147 vrele(fvp);
1148 return (error);
1149 }
1150
1151 #ifdef UFS_ACL
1152 static int
ext2_do_posix1e_acl_inheritance_dir(struct vnode * dvp,struct vnode * tvp,mode_t dmode,struct ucred * cred,struct thread * td)1153 ext2_do_posix1e_acl_inheritance_dir(struct vnode *dvp, struct vnode *tvp,
1154 mode_t dmode, struct ucred *cred, struct thread *td)
1155 {
1156 int error;
1157 struct inode *ip = VTOI(tvp);
1158 struct acl *dacl, *acl;
1159
1160 acl = acl_alloc(M_WAITOK);
1161 dacl = acl_alloc(M_WAITOK);
1162
1163 /*
1164 * Retrieve default ACL from parent, if any.
1165 */
1166 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td);
1167 switch (error) {
1168 case 0:
1169 /*
1170 * Retrieved a default ACL, so merge mode and ACL if
1171 * necessary. If the ACL is empty, fall through to
1172 * the "not defined or available" case.
1173 */
1174 if (acl->acl_cnt != 0) {
1175 dmode = acl_posix1e_newfilemode(dmode, acl);
1176 ip->i_mode = dmode;
1177 *dacl = *acl;
1178 ext2_sync_acl_from_inode(ip, acl);
1179 break;
1180 }
1181 /* FALLTHROUGH */
1182
1183 case EOPNOTSUPP:
1184 /*
1185 * Just use the mode as-is.
1186 */
1187 ip->i_mode = dmode;
1188 error = 0;
1189 goto out;
1190
1191 default:
1192 goto out;
1193 }
1194
1195 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td);
1196 if (error == 0)
1197 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, cred, td);
1198 switch (error) {
1199 case 0:
1200 break;
1201
1202 case EOPNOTSUPP:
1203 /*
1204 * XXX: This should not happen, as EOPNOTSUPP above
1205 * was supposed to free acl.
1206 */
1207 #ifdef DEBUG
1208 printf("ext2_mkdir: VOP_GETACL() but no VOP_SETACL()\n");
1209 #endif /* DEBUG */
1210 break;
1211
1212 default:
1213 goto out;
1214 }
1215
1216 out:
1217 acl_free(acl);
1218 acl_free(dacl);
1219
1220 return (error);
1221 }
1222
1223 static int
ext2_do_posix1e_acl_inheritance_file(struct vnode * dvp,struct vnode * tvp,mode_t mode,struct ucred * cred,struct thread * td)1224 ext2_do_posix1e_acl_inheritance_file(struct vnode *dvp, struct vnode *tvp,
1225 mode_t mode, struct ucred *cred, struct thread *td)
1226 {
1227 int error;
1228 struct inode *ip = VTOI(tvp);
1229 struct acl *acl;
1230
1231 acl = acl_alloc(M_WAITOK);
1232
1233 /*
1234 * Retrieve default ACL for parent, if any.
1235 */
1236 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td);
1237 switch (error) {
1238 case 0:
1239 /*
1240 * Retrieved a default ACL, so merge mode and ACL if
1241 * necessary.
1242 */
1243 if (acl->acl_cnt != 0) {
1244 /*
1245 * Two possible ways for default ACL to not
1246 * be present. First, the EA can be
1247 * undefined, or second, the default ACL can
1248 * be blank. If it's blank, fall through to
1249 * the it's not defined case.
1250 */
1251 mode = acl_posix1e_newfilemode(mode, acl);
1252 ip->i_mode = mode;
1253 ext2_sync_acl_from_inode(ip, acl);
1254 break;
1255 }
1256 /* FALLTHROUGH */
1257
1258 case EOPNOTSUPP:
1259 /*
1260 * Just use the mode as-is.
1261 */
1262 ip->i_mode = mode;
1263 error = 0;
1264 goto out;
1265
1266 default:
1267 goto out;
1268 }
1269
1270 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td);
1271 switch (error) {
1272 case 0:
1273 break;
1274
1275 case EOPNOTSUPP:
1276 /*
1277 * XXX: This should not happen, as EOPNOTSUPP above was
1278 * supposed to free acl.
1279 */
1280 printf("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() "
1281 "but no VOP_SETACL()\n");
1282 /* panic("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() "
1283 "but no VOP_SETACL()"); */
1284 break;
1285
1286 default:
1287 goto out;
1288 }
1289
1290 out:
1291 acl_free(acl);
1292
1293 return (error);
1294 }
1295
1296 #endif /* UFS_ACL */
1297
1298 /*
1299 * Mkdir system call
1300 */
1301 static int
ext2_mkdir(struct vop_mkdir_args * ap)1302 ext2_mkdir(struct vop_mkdir_args *ap)
1303 {
1304 struct m_ext2fs *fs;
1305 struct vnode *dvp = ap->a_dvp;
1306 struct vattr *vap = ap->a_vap;
1307 struct componentname *cnp = ap->a_cnp;
1308 struct inode *ip, *dp;
1309 struct vnode *tvp;
1310 struct dirtemplate dirtemplate, *dtp;
1311 char *buf = NULL;
1312 int error, dmode;
1313
1314 dp = VTOI(dvp);
1315 if ((nlink_t)dp->i_nlink >= EXT4_LINK_MAX &&
1316 !EXT2_HAS_RO_COMPAT_FEATURE(dp->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) {
1317 error = EMLINK;
1318 goto out;
1319 }
1320 dmode = vap->va_mode & 0777;
1321 dmode |= IFDIR;
1322 /*
1323 * Must simulate part of ext2_makeinode here to acquire the inode,
1324 * but not have it entered in the parent directory. The entry is
1325 * made later after writing "." and ".." entries.
1326 */
1327 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp);
1328 if (error)
1329 goto out;
1330 ip = VTOI(tvp);
1331 fs = ip->i_e2fs;
1332 ip->i_gid = dp->i_gid;
1333 #ifdef SUIDDIR
1334 {
1335 /*
1336 * if we are hacking owners here, (only do this where told to)
1337 * and we are not giving it TOO root, (would subvert quotas)
1338 * then go ahead and give it to the other user.
1339 * The new directory also inherits the SUID bit.
1340 * If user's UID and dir UID are the same,
1341 * 'give it away' so that the SUID is still forced on.
1342 */
1343 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1344 (dp->i_mode & ISUID) && dp->i_uid) {
1345 dmode |= ISUID;
1346 ip->i_uid = dp->i_uid;
1347 } else {
1348 ip->i_uid = cnp->cn_cred->cr_uid;
1349 }
1350 }
1351 #else
1352 ip->i_uid = cnp->cn_cred->cr_uid;
1353 #endif
1354 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1355 ip->i_mode = dmode;
1356 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
1357 ip->i_nlink = 2;
1358 if (cnp->cn_flags & ISWHITEOUT)
1359 ip->i_flags |= UF_OPAQUE;
1360 error = ext2_update(tvp, 1);
1361
1362 /*
1363 * Bump link count in parent directory
1364 * to reflect work done below. Should
1365 * be done before reference is created
1366 * so reparation is possible if we crash.
1367 */
1368 ext2_inc_nlink(dp);
1369 dp->i_flag |= IN_CHANGE;
1370 error = ext2_update(dvp, !DOINGASYNC(dvp));
1371 if (error)
1372 goto bad;
1373
1374 /* Initialize directory with "." and ".." from static template. */
1375 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs,
1376 EXT2F_INCOMPAT_FTYPE))
1377 dtp = &mastertemplate;
1378 else
1379 dtp = &omastertemplate;
1380 dirtemplate = *dtp;
1381 dirtemplate.dot_ino = htole32(ip->i_number);
1382 dirtemplate.dotdot_ino = htole32(dp->i_number);
1383 /*
1384 * note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE so let's
1385 * just redefine it - for this function only
1386 */
1387 #undef DIRBLKSIZ
1388 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize
1389 dirtemplate.dotdot_reclen = htole16(DIRBLKSIZ - 12);
1390 buf = malloc(DIRBLKSIZ, M_TEMP, M_WAITOK | M_ZERO);
1391 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) {
1392 dirtemplate.dotdot_reclen =
1393 htole16(le16toh(dirtemplate.dotdot_reclen) -
1394 sizeof(struct ext2fs_direct_tail));
1395 ext2_init_dirent_tail(EXT2_DIRENT_TAIL(buf, DIRBLKSIZ));
1396 }
1397 memcpy(buf, &dirtemplate, sizeof(dirtemplate));
1398 ext2_dirent_csum_set(ip, (struct ext2fs_direct_2 *)buf);
1399 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)buf,
1400 DIRBLKSIZ, (off_t)0, UIO_SYSSPACE,
1401 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED,
1402 NULL, NULL);
1403 if (error) {
1404 ext2_dec_nlink(dp);
1405 dp->i_flag |= IN_CHANGE;
1406 goto bad;
1407 }
1408 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
1409 /* XXX should grow with balloc() */
1410 panic("ext2_mkdir: blksize");
1411 else {
1412 ip->i_size = DIRBLKSIZ;
1413 ip->i_flag |= IN_CHANGE;
1414 }
1415
1416 #ifdef UFS_ACL
1417 if (dvp->v_mount->mnt_flag & MNT_ACLS) {
1418 error = ext2_do_posix1e_acl_inheritance_dir(dvp, tvp, dmode,
1419 cnp->cn_cred, curthread);
1420 if (error)
1421 goto bad;
1422 }
1423
1424 #endif /* UFS_ACL */
1425
1426 /* Directory set up, now install its entry in the parent directory. */
1427 error = ext2_direnter(ip, dvp, cnp);
1428 if (error) {
1429 ext2_dec_nlink(dp);
1430 dp->i_flag |= IN_CHANGE;
1431 }
1432 bad:
1433 /*
1434 * No need to do an explicit VOP_TRUNCATE here, vrele will do this
1435 * for us because we set the link count to 0.
1436 */
1437 if (error) {
1438 ip->i_nlink = 0;
1439 ip->i_flag |= IN_CHANGE;
1440 vput(tvp);
1441 } else
1442 *ap->a_vpp = tvp;
1443 out:
1444 free(buf, M_TEMP);
1445 return (error);
1446 #undef DIRBLKSIZ
1447 #define DIRBLKSIZ DEV_BSIZE
1448 }
1449
1450 /*
1451 * Rmdir system call.
1452 */
1453 static int
ext2_rmdir(struct vop_rmdir_args * ap)1454 ext2_rmdir(struct vop_rmdir_args *ap)
1455 {
1456 struct vnode *vp = ap->a_vp;
1457 struct vnode *dvp = ap->a_dvp;
1458 struct componentname *cnp = ap->a_cnp;
1459 struct inode *ip, *dp;
1460 int error;
1461
1462 ip = VTOI(vp);
1463 dp = VTOI(dvp);
1464
1465 /*
1466 * Verify the directory is empty (and valid).
1467 * (Rmdir ".." won't be valid since
1468 * ".." will contain a reference to
1469 * the current directory and thus be
1470 * non-empty.)
1471 */
1472 if (!ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) {
1473 error = ENOTEMPTY;
1474 goto out;
1475 }
1476 if ((dp->i_flags & APPEND)
1477 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1478 error = EPERM;
1479 goto out;
1480 }
1481 /*
1482 * Delete reference to directory before purging
1483 * inode. If we crash in between, the directory
1484 * will be reattached to lost+found,
1485 */
1486 error = ext2_dirremove(dvp, cnp);
1487 if (error)
1488 goto out;
1489 ext2_dec_nlink(dp);
1490 dp->i_flag |= IN_CHANGE;
1491 cache_purge(dvp);
1492 VOP_UNLOCK(dvp);
1493 /*
1494 * Truncate inode. The only stuff left
1495 * in the directory is "." and "..".
1496 */
1497 ip->i_nlink = 0;
1498 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred,
1499 curthread);
1500 cache_purge(ITOV(ip));
1501 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
1502 VOP_UNLOCK(vp);
1503 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1504 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1505 }
1506 out:
1507 return (error);
1508 }
1509
1510 /*
1511 * symlink -- make a symbolic link
1512 */
1513 static int
ext2_symlink(struct vop_symlink_args * ap)1514 ext2_symlink(struct vop_symlink_args *ap)
1515 {
1516 struct vnode *vp, **vpp = ap->a_vpp;
1517 struct inode *ip;
1518 int len, error;
1519
1520 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
1521 vpp, ap->a_cnp);
1522 if (error)
1523 return (error);
1524 vp = *vpp;
1525 len = strlen(ap->a_target);
1526 if (len < VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) {
1527 ip = VTOI(vp);
1528 bcopy(ap->a_target, (char *)ip->i_shortlink, len);
1529 ip->i_size = len;
1530 ip->i_flag |= IN_CHANGE | IN_UPDATE;
1531 } else
1532 error = vn_rdwr(UIO_WRITE, vp, __DECONST(void *, ap->a_target),
1533 len, (off_t)0, UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
1534 ap->a_cnp->cn_cred, NOCRED, NULL, NULL);
1535 if (error)
1536 vput(vp);
1537 return (error);
1538 }
1539
1540 /*
1541 * Return target name of a symbolic link
1542 */
1543 static int
ext2_readlink(struct vop_readlink_args * ap)1544 ext2_readlink(struct vop_readlink_args *ap)
1545 {
1546 struct vnode *vp = ap->a_vp;
1547 struct inode *ip = VTOI(vp);
1548 int isize;
1549
1550 isize = ip->i_size;
1551 if (isize < VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) {
1552 uiomove((char *)ip->i_shortlink, isize, ap->a_uio);
1553 return (0);
1554 }
1555 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
1556 }
1557
1558 /*
1559 * Calculate the logical to physical mapping if not done already,
1560 * then call the device strategy routine.
1561 *
1562 * In order to be able to swap to a file, the ext2_bmaparray() operation may not
1563 * deadlock on memory. See ext2_bmap() for details.
1564 */
1565 static int
ext2_strategy(struct vop_strategy_args * ap)1566 ext2_strategy(struct vop_strategy_args *ap)
1567 {
1568 struct buf *bp = ap->a_bp;
1569 struct vnode *vp = ap->a_vp;
1570 struct bufobj *bo;
1571 daddr_t blkno;
1572 int error;
1573
1574 if (vp->v_type == VBLK || vp->v_type == VCHR)
1575 panic("ext2_strategy: spec");
1576 if (bp->b_blkno == bp->b_lblkno) {
1577 if (VTOI(ap->a_vp)->i_flag & IN_E4EXTENTS)
1578 error = ext4_bmapext(vp, bp->b_lblkno, &blkno, NULL, NULL);
1579 else
1580 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL);
1581
1582 bp->b_blkno = blkno;
1583 if (error) {
1584 bp->b_error = error;
1585 bp->b_ioflags |= BIO_ERROR;
1586 bufdone(bp);
1587 return (0);
1588 }
1589 if ((long)bp->b_blkno == -1)
1590 vfs_bio_clrbuf(bp);
1591 }
1592 if ((long)bp->b_blkno == -1) {
1593 bufdone(bp);
1594 return (0);
1595 }
1596 bp->b_iooffset = dbtob(bp->b_blkno);
1597 bo = VFSTOEXT2(vp->v_mount)->um_bo;
1598 BO_STRATEGY(bo, bp);
1599 return (0);
1600 }
1601
1602 /*
1603 * Print out the contents of an inode.
1604 */
1605 static int
ext2_print(struct vop_print_args * ap)1606 ext2_print(struct vop_print_args *ap)
1607 {
1608 struct vnode *vp = ap->a_vp;
1609 struct inode *ip = VTOI(vp);
1610
1611 vn_printf(ip->i_devvp, "\tino %ju", (uintmax_t)ip->i_number);
1612 if (vp->v_type == VFIFO)
1613 fifo_printinfo(vp);
1614 printf("\n");
1615 return (0);
1616 }
1617
1618 /*
1619 * Close wrapper for fifos.
1620 *
1621 * Update the times on the inode then do device close.
1622 */
1623 static int
ext2fifo_close(struct vop_close_args * ap)1624 ext2fifo_close(struct vop_close_args *ap)
1625 {
1626 struct vnode *vp = ap->a_vp;
1627
1628 VI_LOCK(vp);
1629 if (vp->v_usecount > 1)
1630 ext2_itimes_locked(vp);
1631 VI_UNLOCK(vp);
1632 return (fifo_specops.vop_close(ap));
1633 }
1634
1635 /*
1636 * Return POSIX pathconf information applicable to ext2 filesystems.
1637 */
1638 static int
ext2_pathconf(struct vop_pathconf_args * ap)1639 ext2_pathconf(struct vop_pathconf_args *ap)
1640 {
1641 int error = 0;
1642
1643 switch (ap->a_name) {
1644 case _PC_LINK_MAX:
1645 if (EXT2_HAS_RO_COMPAT_FEATURE(VTOI(ap->a_vp)->i_e2fs,
1646 EXT2F_ROCOMPAT_DIR_NLINK))
1647 *ap->a_retval = INT_MAX;
1648 else
1649 *ap->a_retval = EXT4_LINK_MAX;
1650 break;
1651 case _PC_NAME_MAX:
1652 *ap->a_retval = NAME_MAX;
1653 break;
1654 case _PC_PIPE_BUF:
1655 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO)
1656 *ap->a_retval = PIPE_BUF;
1657 else
1658 error = EINVAL;
1659 break;
1660 case _PC_CHOWN_RESTRICTED:
1661 *ap->a_retval = 1;
1662 break;
1663 case _PC_NO_TRUNC:
1664 *ap->a_retval = 1;
1665 break;
1666
1667 #ifdef UFS_ACL
1668 case _PC_ACL_EXTENDED:
1669 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS)
1670 *ap->a_retval = 1;
1671 else
1672 *ap->a_retval = 0;
1673 break;
1674 case _PC_ACL_PATH_MAX:
1675 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS)
1676 *ap->a_retval = ACL_MAX_ENTRIES;
1677 else
1678 *ap->a_retval = 3;
1679 break;
1680 #endif /* UFS_ACL */
1681
1682 case _PC_MIN_HOLE_SIZE:
1683 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1684 break;
1685 case _PC_PRIO_IO:
1686 *ap->a_retval = 0;
1687 break;
1688 case _PC_SYNC_IO:
1689 *ap->a_retval = 0;
1690 break;
1691 case _PC_ALLOC_SIZE_MIN:
1692 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize;
1693 break;
1694 case _PC_FILESIZEBITS:
1695 *ap->a_retval = 64;
1696 break;
1697 case _PC_REC_INCR_XFER_SIZE:
1698 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1699 break;
1700 case _PC_REC_MAX_XFER_SIZE:
1701 *ap->a_retval = -1; /* means ``unlimited'' */
1702 break;
1703 case _PC_REC_MIN_XFER_SIZE:
1704 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1705 break;
1706 case _PC_REC_XFER_ALIGN:
1707 *ap->a_retval = PAGE_SIZE;
1708 break;
1709 case _PC_SYMLINK_MAX:
1710 *ap->a_retval = MAXPATHLEN;
1711 break;
1712
1713 default:
1714 error = vop_stdpathconf(ap);
1715 break;
1716 }
1717 return (error);
1718 }
1719
1720 /*
1721 * Vnode operation to remove a named attribute.
1722 */
1723 static int
ext2_deleteextattr(struct vop_deleteextattr_args * ap)1724 ext2_deleteextattr(struct vop_deleteextattr_args *ap)
1725 {
1726 struct inode *ip;
1727 struct m_ext2fs *fs;
1728 int error;
1729
1730 ip = VTOI(ap->a_vp);
1731 fs = ip->i_e2fs;
1732
1733 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
1734 return (EOPNOTSUPP);
1735
1736 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1737 return (EOPNOTSUPP);
1738
1739 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1740 ap->a_cred, ap->a_td, VWRITE);
1741 if (error)
1742 return (error);
1743
1744 error = ENOATTR;
1745
1746 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
1747 error = ext2_extattr_inode_delete(ip, ap->a_attrnamespace, ap->a_name);
1748 if (error != ENOATTR)
1749 return (error);
1750 }
1751
1752 if (ip->i_facl)
1753 error = ext2_extattr_block_delete(ip, ap->a_attrnamespace, ap->a_name);
1754
1755 return (error);
1756 }
1757
1758 /*
1759 * Vnode operation to retrieve a named extended attribute.
1760 */
1761 static int
ext2_getextattr(struct vop_getextattr_args * ap)1762 ext2_getextattr(struct vop_getextattr_args *ap)
1763 {
1764 struct inode *ip;
1765 struct m_ext2fs *fs;
1766 int error;
1767
1768 ip = VTOI(ap->a_vp);
1769 fs = ip->i_e2fs;
1770
1771 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
1772 return (EOPNOTSUPP);
1773
1774 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1775 return (EOPNOTSUPP);
1776
1777 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1778 ap->a_cred, ap->a_td, VREAD);
1779 if (error)
1780 return (error);
1781
1782 if (ap->a_size != NULL)
1783 *ap->a_size = 0;
1784
1785 error = ENOATTR;
1786
1787 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
1788 error = ext2_extattr_inode_get(ip, ap->a_attrnamespace,
1789 ap->a_name, ap->a_uio, ap->a_size);
1790 if (error != ENOATTR)
1791 return (error);
1792 }
1793
1794 if (ip->i_facl)
1795 error = ext2_extattr_block_get(ip, ap->a_attrnamespace,
1796 ap->a_name, ap->a_uio, ap->a_size);
1797
1798 return (error);
1799 }
1800
1801 /*
1802 * Vnode operation to retrieve extended attributes on a vnode.
1803 */
1804 static int
ext2_listextattr(struct vop_listextattr_args * ap)1805 ext2_listextattr(struct vop_listextattr_args *ap)
1806 {
1807 struct inode *ip;
1808 struct m_ext2fs *fs;
1809 int error;
1810
1811 ip = VTOI(ap->a_vp);
1812 fs = ip->i_e2fs;
1813
1814 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
1815 return (EOPNOTSUPP);
1816
1817 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1818 return (EOPNOTSUPP);
1819
1820 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1821 ap->a_cred, ap->a_td, VREAD);
1822 if (error)
1823 return (error);
1824
1825 if (ap->a_size != NULL)
1826 *ap->a_size = 0;
1827
1828 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
1829 error = ext2_extattr_inode_list(ip, ap->a_attrnamespace,
1830 ap->a_uio, ap->a_size);
1831 if (error)
1832 return (error);
1833 }
1834
1835 if (ip->i_facl)
1836 error = ext2_extattr_block_list(ip, ap->a_attrnamespace,
1837 ap->a_uio, ap->a_size);
1838
1839 return (error);
1840 }
1841
1842 /*
1843 * Vnode operation to set a named attribute.
1844 */
1845 static int
ext2_setextattr(struct vop_setextattr_args * ap)1846 ext2_setextattr(struct vop_setextattr_args *ap)
1847 {
1848 struct inode *ip;
1849 struct m_ext2fs *fs;
1850 int error;
1851
1852 ip = VTOI(ap->a_vp);
1853 fs = ip->i_e2fs;
1854
1855 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
1856 return (EOPNOTSUPP);
1857
1858 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1859 return (EOPNOTSUPP);
1860
1861 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1862 ap->a_cred, ap->a_td, VWRITE);
1863 if (error)
1864 return (error);
1865
1866 error = ext2_extattr_valid_attrname(ap->a_attrnamespace, ap->a_name);
1867 if (error)
1868 return (error);
1869
1870 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
1871 error = ext2_extattr_inode_set(ip, ap->a_attrnamespace,
1872 ap->a_name, ap->a_uio);
1873 if (error != ENOSPC)
1874 return (error);
1875 }
1876
1877 error = ext2_extattr_block_set(ip, ap->a_attrnamespace,
1878 ap->a_name, ap->a_uio);
1879
1880 return (error);
1881 }
1882
1883 /*
1884 * Vnode pointer to File handle
1885 */
1886 /* ARGSUSED */
1887 static int
ext2_vptofh(struct vop_vptofh_args * ap)1888 ext2_vptofh(struct vop_vptofh_args *ap)
1889 {
1890 struct inode *ip;
1891 struct ufid *ufhp;
1892
1893 ip = VTOI(ap->a_vp);
1894 ufhp = (struct ufid *)ap->a_fhp;
1895 ufhp->ufid_len = sizeof(struct ufid);
1896 ufhp->ufid_ino = ip->i_number;
1897 ufhp->ufid_gen = ip->i_gen;
1898 return (0);
1899 }
1900
1901 /*
1902 * Initialize the vnode associated with a new inode, handle aliased
1903 * vnodes.
1904 */
1905 int
ext2_vinit(struct mount * mntp,struct vop_vector * fifoops,struct vnode ** vpp)1906 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp)
1907 {
1908 struct inode *ip;
1909 struct vnode *vp;
1910
1911 vp = *vpp;
1912 ip = VTOI(vp);
1913 vp->v_type = IFTOVT(ip->i_mode);
1914 /*
1915 * Only unallocated inodes should be of type VNON.
1916 */
1917 if (ip->i_mode != 0 && vp->v_type == VNON)
1918 return (EINVAL);
1919 if (vp->v_type == VFIFO)
1920 vp->v_op = fifoops;
1921
1922 if (ip->i_number == EXT2_ROOTINO)
1923 vp->v_vflag |= VV_ROOT;
1924 ip->i_modrev = init_va_filerev();
1925 *vpp = vp;
1926 return (0);
1927 }
1928
1929 /*
1930 * Allocate a new inode.
1931 */
1932 static int
ext2_makeinode(int mode,struct vnode * dvp,struct vnode ** vpp,struct componentname * cnp)1933 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
1934 struct componentname *cnp)
1935 {
1936 struct inode *ip, *pdir;
1937 struct vnode *tvp;
1938 int error;
1939
1940 pdir = VTOI(dvp);
1941 *vpp = NULL;
1942 if ((mode & IFMT) == 0)
1943 mode |= IFREG;
1944
1945 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp);
1946 if (error) {
1947 return (error);
1948 }
1949 ip = VTOI(tvp);
1950 ip->i_gid = pdir->i_gid;
1951 #ifdef SUIDDIR
1952 {
1953 /*
1954 * if we are
1955 * not the owner of the directory,
1956 * and we are hacking owners here, (only do this where told to)
1957 * and we are not giving it TOO root, (would subvert quotas)
1958 * then go ahead and give it to the other user.
1959 * Note that this drops off the execute bits for security.
1960 */
1961 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1962 (pdir->i_mode & ISUID) &&
1963 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
1964 ip->i_uid = pdir->i_uid;
1965 mode &= ~07111;
1966 } else {
1967 ip->i_uid = cnp->cn_cred->cr_uid;
1968 }
1969 }
1970 #else
1971 ip->i_uid = cnp->cn_cred->cr_uid;
1972 #endif
1973 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1974 ip->i_mode = mode;
1975 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
1976 ip->i_nlink = 1;
1977 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) {
1978 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID))
1979 ip->i_mode &= ~ISGID;
1980 }
1981
1982 if (cnp->cn_flags & ISWHITEOUT)
1983 ip->i_flags |= UF_OPAQUE;
1984
1985 /*
1986 * Make sure inode goes to disk before directory entry.
1987 */
1988 error = ext2_update(tvp, !DOINGASYNC(tvp));
1989 if (error)
1990 goto bad;
1991
1992 #ifdef UFS_ACL
1993 if (dvp->v_mount->mnt_flag & MNT_ACLS) {
1994 error = ext2_do_posix1e_acl_inheritance_file(dvp, tvp, mode,
1995 cnp->cn_cred, curthread);
1996 if (error)
1997 goto bad;
1998 }
1999 #endif /* UFS_ACL */
2000
2001 error = ext2_direnter(ip, dvp, cnp);
2002 if (error)
2003 goto bad;
2004
2005 *vpp = tvp;
2006 return (0);
2007
2008 bad:
2009 /*
2010 * Write error occurred trying to update the inode
2011 * or the directory so must deallocate the inode.
2012 */
2013 ip->i_nlink = 0;
2014 ip->i_flag |= IN_CHANGE;
2015 vput(tvp);
2016 return (error);
2017 }
2018
2019 /*
2020 * Vnode op for reading.
2021 */
2022 static int
ext2_read(struct vop_read_args * ap)2023 ext2_read(struct vop_read_args *ap)
2024 {
2025 struct vnode *vp;
2026 struct inode *ip;
2027 struct uio *uio;
2028 struct m_ext2fs *fs;
2029 struct buf *bp;
2030 daddr_t lbn, nextlbn;
2031 off_t bytesinfile;
2032 long size, xfersize, blkoffset;
2033 int error, orig_resid, seqcount;
2034 int ioflag;
2035
2036 vp = ap->a_vp;
2037 uio = ap->a_uio;
2038 ioflag = ap->a_ioflag;
2039
2040 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
2041 ip = VTOI(vp);
2042
2043 #ifdef INVARIANTS
2044 if (uio->uio_rw != UIO_READ)
2045 panic("%s: mode", "ext2_read");
2046
2047 if (vp->v_type == VLNK) {
2048 if ((int)ip->i_size <
2049 VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen)
2050 panic("%s: short symlink", "ext2_read");
2051 } else if (vp->v_type != VREG && vp->v_type != VDIR)
2052 panic("%s: type %d", "ext2_read", vp->v_type);
2053 #endif
2054 orig_resid = uio->uio_resid;
2055 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0"));
2056 if (orig_resid == 0)
2057 return (0);
2058 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0"));
2059 fs = ip->i_e2fs;
2060 if (uio->uio_offset < ip->i_size &&
2061 uio->uio_offset >= fs->e2fs_maxfilesize)
2062 return (EOVERFLOW);
2063
2064 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
2065 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
2066 break;
2067 lbn = lblkno(fs, uio->uio_offset);
2068 nextlbn = lbn + 1;
2069 size = blksize(fs, ip, lbn);
2070 blkoffset = blkoff(fs, uio->uio_offset);
2071
2072 xfersize = fs->e2fs_fsize - blkoffset;
2073 if (uio->uio_resid < xfersize)
2074 xfersize = uio->uio_resid;
2075 if (bytesinfile < xfersize)
2076 xfersize = bytesinfile;
2077
2078 if (lblktosize(fs, nextlbn) >= ip->i_size)
2079 error = bread(vp, lbn, size, NOCRED, &bp);
2080 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
2081 error = cluster_read(vp, ip->i_size, lbn, size,
2082 NOCRED, blkoffset + uio->uio_resid, seqcount,
2083 0, &bp);
2084 } else if (seqcount > 1) {
2085 u_int nextsize = blksize(fs, ip, nextlbn);
2086
2087 error = breadn(vp, lbn,
2088 size, &nextlbn, &nextsize, 1, NOCRED, &bp);
2089 } else
2090 error = bread(vp, lbn, size, NOCRED, &bp);
2091 if (error) {
2092 brelse(bp);
2093 bp = NULL;
2094 break;
2095 }
2096
2097 /*
2098 * We should only get non-zero b_resid when an I/O error
2099 * has occurred, which should cause us to break above.
2100 * However, if the short read did not cause an error,
2101 * then we want to ensure that we do not uiomove bad
2102 * or uninitialized data.
2103 */
2104 size -= bp->b_resid;
2105 if (size < xfersize) {
2106 if (size == 0)
2107 break;
2108 xfersize = size;
2109 }
2110 error = uiomove((char *)bp->b_data + blkoffset,
2111 (int)xfersize, uio);
2112 if (error)
2113 break;
2114 vfs_bio_brelse(bp, ioflag);
2115 }
2116
2117 /*
2118 * This can only happen in the case of an error because the loop
2119 * above resets bp to NULL on each iteration and on normal
2120 * completion has not set a new value into it. so it must have come
2121 * from a 'break' statement
2122 */
2123 if (bp != NULL)
2124 vfs_bio_brelse(bp, ioflag);
2125
2126 if ((error == 0 || uio->uio_resid != orig_resid) &&
2127 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0)
2128 ip->i_flag |= IN_ACCESS;
2129 return (error);
2130 }
2131
2132 static int
ext2_ioctl(struct vop_ioctl_args * ap)2133 ext2_ioctl(struct vop_ioctl_args *ap)
2134 {
2135 struct vnode *vp;
2136 int error;
2137
2138 vp = ap->a_vp;
2139 switch (ap->a_command) {
2140 case FIOSEEKDATA:
2141 if (!(VTOI(vp)->i_flag & IN_E4EXTENTS)) {
2142 error = vn_lock(vp, LK_SHARED);
2143 if (error == 0) {
2144 error = ext2_bmap_seekdata(vp,
2145 (off_t *)ap->a_data);
2146 VOP_UNLOCK(vp);
2147 } else
2148 error = EBADF;
2149 return (error);
2150 }
2151 case FIOSEEKHOLE:
2152 return (vn_bmap_seekhole(vp, ap->a_command,
2153 (off_t *)ap->a_data, ap->a_cred));
2154 default:
2155 return (ENOTTY);
2156 }
2157 }
2158
2159 /*
2160 * Vnode op for writing.
2161 */
2162 static int
ext2_write(struct vop_write_args * ap)2163 ext2_write(struct vop_write_args *ap)
2164 {
2165 struct vnode *vp;
2166 struct uio *uio;
2167 struct inode *ip;
2168 struct m_ext2fs *fs;
2169 struct buf *bp;
2170 daddr_t lbn;
2171 off_t osize;
2172 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize;
2173
2174 ioflag = ap->a_ioflag;
2175 uio = ap->a_uio;
2176 vp = ap->a_vp;
2177
2178 seqcount = ioflag >> IO_SEQSHIFT;
2179 ip = VTOI(vp);
2180
2181 #ifdef INVARIANTS
2182 if (uio->uio_rw != UIO_WRITE)
2183 panic("%s: mode", "ext2_write");
2184 #endif
2185
2186 switch (vp->v_type) {
2187 case VREG:
2188 if (ioflag & IO_APPEND)
2189 uio->uio_offset = ip->i_size;
2190 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
2191 return (EPERM);
2192 /* FALLTHROUGH */
2193 case VLNK:
2194 break;
2195 case VDIR:
2196 /* XXX differs from ffs -- this is called from ext2_mkdir(). */
2197 if ((ioflag & IO_SYNC) == 0)
2198 panic("ext2_write: nonsync dir write");
2199 break;
2200 default:
2201 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp,
2202 vp->v_type, (intmax_t)uio->uio_offset,
2203 (intmax_t)uio->uio_resid);
2204 }
2205
2206 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0"));
2207 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0"));
2208 fs = ip->i_e2fs;
2209 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize)
2210 return (EFBIG);
2211 /*
2212 * Maybe this should be above the vnode op call, but so long as
2213 * file servers have no limits, I don't think it matters.
2214 */
2215 error = vn_rlimit_fsize(vp, uio, uio->uio_td);
2216 if (error != 0)
2217 return (error);
2218
2219 resid = uio->uio_resid;
2220 osize = ip->i_size;
2221 if (seqcount > BA_SEQMAX)
2222 flags = BA_SEQMAX << BA_SEQSHIFT;
2223 else
2224 flags = seqcount << BA_SEQSHIFT;
2225 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp))
2226 flags |= IO_SYNC;
2227
2228 for (error = 0; uio->uio_resid > 0;) {
2229 lbn = lblkno(fs, uio->uio_offset);
2230 blkoffset = blkoff(fs, uio->uio_offset);
2231 xfersize = fs->e2fs_fsize - blkoffset;
2232 if (uio->uio_resid < xfersize)
2233 xfersize = uio->uio_resid;
2234 if (uio->uio_offset + xfersize > ip->i_size)
2235 vnode_pager_setsize(vp, uio->uio_offset + xfersize);
2236
2237 /*
2238 * We must perform a read-before-write if the transfer size
2239 * does not cover the entire buffer.
2240 */
2241 if (fs->e2fs_bsize > xfersize)
2242 flags |= BA_CLRBUF;
2243 else
2244 flags &= ~BA_CLRBUF;
2245 error = ext2_balloc(ip, lbn, blkoffset + xfersize,
2246 ap->a_cred, &bp, flags);
2247 if (error != 0)
2248 break;
2249
2250 if ((ioflag & (IO_SYNC | IO_INVAL)) == (IO_SYNC | IO_INVAL))
2251 bp->b_flags |= B_NOCACHE;
2252 if (uio->uio_offset + xfersize > ip->i_size)
2253 ip->i_size = uio->uio_offset + xfersize;
2254 size = blksize(fs, ip, lbn) - bp->b_resid;
2255 if (size < xfersize)
2256 xfersize = size;
2257
2258 error =
2259 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
2260 /*
2261 * If the buffer is not already filled and we encounter an
2262 * error while trying to fill it, we have to clear out any
2263 * garbage data from the pages instantiated for the buffer.
2264 * If we do not, a failed uiomove() during a write can leave
2265 * the prior contents of the pages exposed to a userland mmap.
2266 *
2267 * Note that we need only clear buffers with a transfer size
2268 * equal to the block size because buffers with a shorter
2269 * transfer size were cleared above by the call to ext2_balloc()
2270 * with the BA_CLRBUF flag set.
2271 *
2272 * If the source region for uiomove identically mmaps the
2273 * buffer, uiomove() performed the NOP copy, and the buffer
2274 * content remains valid because the page fault handler
2275 * validated the pages.
2276 */
2277 if (error != 0 && (bp->b_flags & B_CACHE) == 0 &&
2278 fs->e2fs_bsize == xfersize)
2279 vfs_bio_clrbuf(bp);
2280
2281 vfs_bio_set_flags(bp, ioflag);
2282
2283 /*
2284 * If IO_SYNC each buffer is written synchronously. Otherwise
2285 * if we have a severe page deficiency write the buffer
2286 * asynchronously. Otherwise try to cluster, and if that
2287 * doesn't do it then either do an async write (if O_DIRECT),
2288 * or a delayed write (if not).
2289 */
2290 if (ioflag & IO_SYNC) {
2291 (void)bwrite(bp);
2292 } else if (vm_page_count_severe() ||
2293 buf_dirty_count_severe() ||
2294 (ioflag & IO_ASYNC)) {
2295 bp->b_flags |= B_CLUSTEROK;
2296 bawrite(bp);
2297 } else if (xfersize + blkoffset == fs->e2fs_fsize) {
2298 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
2299 bp->b_flags |= B_CLUSTEROK;
2300 cluster_write(vp, &ip->i_clusterw, bp,
2301 ip->i_size, seqcount, 0);
2302 } else {
2303 bawrite(bp);
2304 }
2305 } else if (ioflag & IO_DIRECT) {
2306 bp->b_flags |= B_CLUSTEROK;
2307 bawrite(bp);
2308 } else {
2309 bp->b_flags |= B_CLUSTEROK;
2310 bdwrite(bp);
2311 }
2312 if (error || xfersize == 0)
2313 break;
2314 }
2315 /*
2316 * If we successfully wrote any data, and we are not the superuser
2317 * we clear the setuid and setgid bits as a precaution against
2318 * tampering.
2319 */
2320 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid &&
2321 ap->a_cred) {
2322 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID))
2323 ip->i_mode &= ~(ISUID | ISGID);
2324 }
2325 if (error) {
2326 if (ioflag & IO_UNIT) {
2327 (void)ext2_truncate(vp, osize,
2328 ioflag & IO_SYNC, ap->a_cred, uio->uio_td);
2329 uio->uio_offset -= resid - uio->uio_resid;
2330 uio->uio_resid = resid;
2331 }
2332 }
2333 if (uio->uio_resid != resid) {
2334 ip->i_flag |= IN_CHANGE | IN_UPDATE;
2335 if (ioflag & IO_SYNC)
2336 error = ext2_update(vp, 1);
2337 }
2338 return (error);
2339 }
2340